<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <div id="app">
      <ul>
        <li v-for="item in ary">{{item}}</li>
      </ul>
      <button @click="btn">走一走</button>
    </div>
    <script src="./vue.js"></script>
    <script>
      const app = new Vue({
        el: "#app",
        data: {
          ary: ["帅哥", "美女", "程序员"],
        },
        methods: {
          btn() {
            this.ary.push(this.ary[0]);
            this.ary.shift();
          },
        },
      });
    </script>
  </body>
</html>
